That depends. Is Stormbreaker suddenly the size of Kong's axe? If so, is a Kong sized being swinging it? Is it simply being swung(as then it's just an indestructible, really sharp maul), or is it charged with Thor's lightning?
I'm asking because you can't directly compare 2 weapons so wildly different in size. What being in your example could even swing the axe and stormbreaker with the same force? I'm curious. If they're big enough to swing the axe like normal, they won't even be able to grip Stormbreaker between their fingers because it's too small. And if they can swing Stormbreaker like normal, the axe would be several thousand times larger than them.
Also while the charged axe has more cutting power from the radiation, it simply gains better cutting power temporarily while it retains a charge which can run out. Stormbreaker can control massive lightning storms and it doesn't need an outside source which probably won't be around in Godzilla to charge it up. Thor can power it infinitely.
Size has always been important when it comes to melee weapons in real life. That's why zweihanders exist, so it's fair to take the size of Kong's axe into account.
That's why in my first post I said that if the axe is charged it's more powerful than Stormbreaker.
Yeah but there's a difference between a Longsword being a few feet and light and a flamberge or zweihander being longer and slightly heavier...to a 5 foot maul being compared to an axe wielded by a 400 foot tall gorilla. You cant measure them the same way. That's like saying what's faster? A supercar or a truck that's 400 feet long? The truck seems faster because it's so much bigger that it crosses massive distance just by moving whereas the car has to actually drive fast over long distances.
And again if the axe is charged it only increases cutting power on an already massive item than can pretty much cut through anything because it's so big and indestructible and sharp. Stormbreaker actually has "power" not just a hot edge.
I know the axe is more powerful simply because it's bigger. Thats blatantly obvious.
I'm saying that the two can't be compared in their normal states without the comparison being naturally skewed to one side or simply not able to be properly compared. They are far too different.
If it's so simple, why even ask? Which does more damage? A bobby pin or a greatsword? A campfire or a MOAB? A tonka truck or a fully loaded 18 wheeler?
Obviously one is greater but they're in completely separate realms and can never be "compared" in the actual sense of the word. Like when you asked if Thor could cut apart Mecha G with Stormbreaker was a dumb question because obviously the axe Kong used is so much larger it can't be just like it unless Thor and Stormbreaker were Kong sized, then the answer would obviously be yes.
Anyway, you're willfully ignoring what I'm saying so yes, the several hundred foot tall, several thousand ton axe does more physical damage when swung than the 5 foot long Stormbreaker. Just like a fully geared up linebacker does more damage than a newborn crawling into your leg.